Shock-absorber.



W. R. FROMMATER.

SHOCK ABSORBER.

' APPLICATION FILED NOV. 14, 1913. 1,089,830 Patented Mar.10,1914.

2 SHEETS-SHEET 1.

QXi-liweoaeo E] De Moz W. R. FROMMATER.

SHOCK ABSORBER.

2 SHEETSSHEBT 2.

OFFICE.

WILLY R. FROMMATEB I, OF LONG ISLAND CITY, NEW YORK.

SHOCK-ABSORBER Specification of Letters Patent.

Patented Mar. 10, 1914.

Application filed-November 14, 1913. Serial No. 800,945.

To all whom it may concern:

Be it known that I, WILLY R. FROMMATER, a citizen of the German Empire, and a resident of Long Island City, in the county of Queens and State of New York, have invented certain new and useful Improvements in Shock-Absorbers, of which the following is a specification.

This invention relates to shock-absorbers and has for its object to provide an improved device whichwill be quick in its action in response to movement applied, and resistant to prevent violent shocks.

For this purpose my invention consists of certain new and useful improvements, which will be more fully described hereinafter and finally pointed out in the claims.

Inthe accompanying drawing, Figure 1 is a rear-view of an automobile showing one embodiment of the invention applied thereto, Fig. 2 is a rear-view of the rearaxle of the automobile, showing another embodiment of the invention, Fig. 3 is an elevation, on a larger scale, of the device shown in Fig. 1, Fig. 4 is an elevation of the device shown in Fig. 2, Fig. 5 is a vertical longitudinal section of the thrust-rod and connected parts, Figs. 6 and 7 are vertical sections respectively on lines 6 and 7 of Fig. 5, and Fig. 8 is an elevation of the movable sleeve mounted on the thrust-rod.

Similar reference numerals indicate correspondin parts throughout the several figures of t e drawing.

Referring to the drawing, and more particularly to Fig. 1, the rear-axle 10 of an automobile is here shown provided with my improved shock-absorber, (this being placed intermediate the axle 10 and frame 11. In Fig. 2, an arrangement of another embodiment is shown, in which the shock-absorber is again shown in the position between the rear-axle and the springs 12.

In Fig. 3, an enlarged view of my improved shock-absorber is shown, in which links are pivoted to the axle 10 and to the frame 11. The ends of these links 15 are also loosely connected to a two-part movable sleeve 16, which is provided with internal lugs 17 adapted to engage the spiral grooves 18 of the thrust-rod or shaft 19. The shaft 19 has an intermediate adjusting device 20 which is screw-threaded to engage the screwthreaded ends of the shaft 19, which intermediate device has shoulders 21 with which the ends of a spiral spring 22 are connected,

the other ends of which are connected with the sleeve 16. Against the other sides of the sleeves 16, other spiral springs 23 are arranged, which have their free ends connected with abutments 24 secured to the shaft 19.

In the embodiment shown in Fig. 4, one sleeve 16 is provided which has projecting members which have pivoted rods 31 which have their free ends pivoted to the rear-axle 32 and frame 33 respectively, and have the auxiliary links 34 pivoted at35 to the rear-end of the shaft 19. This shaft is again provided with spirally-arranged grooves 18, which are engaged by the inwardly-projecting lugs 17 of the sleeve 16, and-between the sleeve 16 and end members 38 spiral springs 39 are arranged. Thus, when the links 31 are moved toward each other, and in the case of the structure of Fig. 3, the links 15 are moved toward each other, the sleeve or sleeves 16 are moved toward the end of the shaft or shafts'as the case may be. It is necessary, on the one hand, to overcome the tension of one spring and the compression of the other spring, and, on the other hand, for the lugs 17 to move along the spiral grooves, and thereby overcome the friction therewith caused by the torsion of the springs. Thus, by the tension and compression of the springs and their resistance to torsion, any sudden movement 1s translated into an evenand e ualized movement and the object of a shock-a sorber is accomplished. The sleeves, alsd theabutments at the ends of the rods, are provided each with a plurality'of sockets 50 forthe springs, so that the torsion of the springs may be adjusted by placing the spring-end in any one of the sockets, and. thereby the resistance of the device ad usted to the point been shown and described, but it is obvious to the rear-axle or to any other por that changes may be made therein without departing from the spirit of the invention.

I claim:

1. In a shock-absorber for use between two points of compression in a moving vehic1e,a shaft having spiral grooves, a movable sleeve having. interiorly-extending lugs engaging the grooves and movable along the shaft, a spring at either side of the sleeve,

and members connected with the sleeve for' moving the same, said movement necessitating the overcoming of the frlction of the lugs in the spiral grooves, and the tension ed to engage the grooves, a spring secured 1 bers threaded together, a helical spring fixed.

at one end to one member and at the other end to the other member, means for preventing rotation of one of said members, and motion-transmitting means for connecting the other member with the source of shock. In testimony that I claim the foregoing as my invention, I have signed my name in presence of two subscribing witnesses.

W'ILLY R. rnoM ATEn Witnesses 1B. Hose, Gr. LOWE. 

